Question

The work done on a system is time dependent, where W(t) = (2.00 J/s)t + (0.500 J/s^3)t^3. ? (a) What is the instantaneous power at t = 0.655s and (b) t = 1.36s? Now let us assume that we know the instantaneous power to be P(t) = (3.50 J/s^2)t + (1.50 J/s^3)t^2. Assuming that there is no work done on the system at t = 0, what is work done at (c) t = 0.855s and (d) t = 1.45s?